Eliminate uses of pkg_resources

[jwodder]

Closes #7435.

[yarikoptic]

Thank you! windows on appveyor isn't happy though:

=========================== short test summary info ===========================
FAILED ..\datalad\core\local\tests\test_create.py::test_bad_cfg_proc - NameError: name 'as_file' is not defined
FAILED ..\datalad\core\local\tests\test_create.py::test_create_withcfg - NameError: name 'as_file' is not defined
=========== 2 failed, 232 passed, 24 skipped in 1685.19s (0:28:05) ============
Command exited with code 1

[jwodder]

@yarikoptic Should be fixed now.

[codecov]

Codecov Report

Patch coverage: 80.00% and project coverage change: -0.01 ⚠️

Comparison is base (684c842) 91.51% compared to head (c888fae) 91.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##            maint    #7439      +/-   ##
==========================================
- Coverage   91.51%   91.50%   -0.01%     
==========================================
  Files         325      325              
  Lines       43392    43402      +10     
  Branches     5819     5822       +3     
==========================================
+ Hits        39711    39717       +6     
- Misses       3666     3670       +4     
  Partials       15       15              

Impacted Files	Coverage Δ
datalad/cli/parser.py	85.33% <54.54%> (-1.16%)	⬇️
datalad/support/external_versions.py	95.58% <87.50%> (-0.51%)	⬇️
datalad/local/run_procedure.py	96.31% <100.00%> (+0.11%)	⬆️

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[yarikoptic]

It was green back then, debian has the dependency even in oldstable so let's proceed

[yarikoptic-gitmate]

PR released in 0.19.3